Ca2+ and Mg2+ are hard Lewisacids and thus forms aqua ions if water is present in the synthetic process. All solid Ca2+ and Mg2+ salts studied in this work contained water molecules coordinated that have been detected by IR and TGA/DSC. Fe2+ is a medium hard Lewisacid and Fe3+ is a hard one. In acetone they do not coordinate to cobaltabis(dicarbollide) anion, but are solvated by acetone. The studied
一价阳离子、Cs +和烷基铵([NR 4 ] +)盐传统上用于沉淀硼烷、碳硼烷和金属碳硼烷簇的阴离子。相比之下,在身体和一般生物体中,二价阳离子具有特殊的相关性。在这项工作中,我们首次分离出具有生物学重要性的生物相容性二价阳离子的钴双(二碳化物)盐,可在生物学和材料科学中应用。阴离子碘化氨基-[C 2 B 9 H 12 ] -的Ca 2+、Mg 2+和Fe 2+盐的制备和钴(二碳化物)及其二碘化、四碘化和八碘化衍生物都有报道。Ca 2+和Mg 2+是硬路易斯酸,因此如果合成过程中存在水,则会形成水离子。在这项工作中研究的所有固体 Ca 2+和 Mg 2+盐都含有配位的水分子,这些水分子已被 IR 和 TGA/DSC 检测到。Fe 2+是中等硬度的路易斯酸,Fe 3+是硬的。在丙酮中,它们不配位钴双(二碳化物)阴离子,而是被丙酮溶剂化。所研究的碘化钴 (dicarbollide) 的Ca 2
Formation of Bridging Alkene and Conjugated Dialkenes Exclusively Generated from Alkynes on the [3,3‘-Co(1,2-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>]<sup>-</sup> Platform. The Unique Hydroboration Role of [3,3‘-Co(1,2-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>]<sup>-</sup>
The unprecedented metal-mediated transformation of an alkyne into a B,B' bridging alkene is reported. Also, the unprecedented synthesis of a conjugated dialkene derivative of [3,3'-Co(1,2-C2B9H11)2]- generated only from an alkyne, contrary to the usual case where an alkyne and an alkene are needed, is described. This has been possible through the singular capacity of a B-H to produce hydroboration.
Methylation and Demethylation in Cobaltabis(dicarbollide) Derivatives
B(8)-R and B(8')-R (R = alkyl) disubstituted derivatives of the cobaltabis(dicarbollide) anion [3,3'-Co(C2B9H11)(2)](-) are reported. The synthesis was achieved by application of a modified Kumada reaction to produce B-C bonds. Molecules containing B(8)-C and B-O bonds are also generated, and interestingly, a high-yield intramolecular oxodemethylation is observed for the first time in boron cluster chemistry. It is also shown that the B-11 NMR spectrum of Cs[3,3'-Co(C2B9H11)(2)] derivatives is the result of the addition of the individual halves.